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Now its charitable, everyone ignores complaints

Just a thought, if MIs (or 18th ed) stated RCD protection, could we see reduction of cpc CSA in fittings or reduced conductivity of materials?

Humblest apologies to John Barleycorn, may his great prosperity ne'er fail in auld Scotland.

In a whiskey distillery

22db might be the lowest noise level registered on your meter, it is very quiet. Have you managed to find a place where you can't hear the noise but the meter registers lower than 22db?  Same with the spectrograph. You need to be sure of what you are measuring. I foresee a journey in the near...

Or polarity of whole installation? Perhaps the batteries are dead and need charging up. It should say in the MIs though.

Kerching enterprises dot con?

Agree with sharpend. Once you start digging and banging around, you might find yourself replacing whole sections of pipe.

Or put up a sign saying "Welcome to Woking", that will confuse the hell out of them

something like https://www.screwfix.com/p/floplast-sp302-vent-terminal-black/33239?tc=DB3&ds_rl=1249799&ds_rl=1245250&ds_rl=1249481&gclid=EAIaIQobChMI5JTVoPf62AIVz7DtCh38QwxnEAQYAiABEgKlNfD_BwE&gclsrc=aw.ds&dclid=CJ6nxa33-tgCFUcSGwodOsoCGg on a bit of 4" soil pipe pushed...

If you have a water meter fitted out on the street that is the best place to turn off the water. There should be a key in there.

Some people call me Bob, which is a palindrome.😋

Water leak under floor? Turn off mains.

Have you tried switching off the mains and seeing if it disappears? Then turning on each circuit until it reappears.

If you only have a square external grill, mark the internal end of the duct with horizontal lines so you can level it from inside.

As far as I can see it, a DP switch, as opposed to a SP switch, is only required for 1. water heaters having immersed and uninsulated elements (554.3.3) 2. where MIs specify them (134.1.1) or 3. installations other than TN-C-S or TNS (537.1.2) due to the neutral being reliably connected to earth

What do the Manufacturer's Instructions say? Link possibly? I assume they specify DP isolation.

554.3.3 although depends on the type of water heater. I can't see why control needs to be done at the reception. Surely at the end of each 'tenancy' the rooms would be cleaned and any switches which were intentionally switched off could be switched back on ready for the next occupants. The...

What timers are you using? And where will they be fitted?

upload to somewhere like dropbox, then post the link here